body {
  padding-top: 40px;
  padding-bottom: 40px;
  background-color: #eee;
  font-family: 'Open Sans','Helvetica Neue',Arial,'Hiragino Sans GB','Microsoft YaHei','WenQuanYi Micro Hei',sans-serif;
}
.qrcode{
  max-width: 260px;
  max-height: 260px;
  text-align:left;
}
.form-signin {
  max-width: 400px;
  padding: 15px;
  margin: 0 auto;
}
.form-signin .form-signin-heading,
.form-signin .checkbox {
  margin-bottom: 10px;
}
.form-signin .checkbox {
  font-weight: normal;
}
.form-signin .form-control {
  position: relative;
  height: auto;
  -webkit-box-sizing: border-box;
     -moz-box-sizing: border-box;
          box-sizing: border-box;
  padding: 10px;
  font-size: 20px;
}
.form-signin .form-control:focus {
  z-index: 2;
}
.form-signin input[type="password"] {
  margin-bottom: 10px;
  border-top-left-radius: 0;
  border-top-right-radius: 0;
}
.footer{
  max-width: 500px;
  padding: 15px;
  margin: 0 auto;
  margin-top: 100px;
  text-align: center; 
  color:#6E6E6E;
}